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authorPavel Begunkov <asml.silence@gmail.com>2019-05-23 18:39:16 +0300
committerJens Axboe <axboe@kernel.dk>2019-07-01 11:57:12 -0600
commit417232880c8a646739dbf4666a231505a1917fcb (patch)
treedb1dc62d7382a6571e0e5ace415281baa1884c43 /block
parent79d08f89bb1b5c2c1ff90d9bb95497ab9e8aa7e0 (diff)
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sbitmap: Replace cmpxchg with xchg
cmpxchg() with an immediate value could be replaced with less expensive xchg(). The same true if new value don't _depend_ on the old one. In the second block, atomic_cmpxchg() return value isn't checked, so after atomic_cmpxchg() -> atomic_xchg() conversion it could be replaced with atomic_set(). Comparison with atomic_read() in the second chunk was left as an optimisation (if that was the initial intention). Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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